If you are a fan of McDonald's - and in particular the Big Mac - then you are going to LOVE this nifty trick we have spotted on the MoneySavingExpert website.

Martin Lewis' team have discovered how to get a Big Mac and regular fries - usually priced at over £4 - for just £1.99.

All you have to do is buy an item - one of the cheapest on the menu is the 59p Fancymini McFlurry - and then fill out a quick survey.

Here's how it works:

1. You’ll firstly need to buy any item in McDonald’s and keep the receipt – you may have to ask for it. If you just want a Big Mac and fries, it’s cheaper to buy a drink or McFlurry cone first, then fill out the survey to get your voucher.

2. On the top of every receipt you’ll see ‘tell us how we did’ and the URL of the Food for Thoughts website, as well as a code to input on the website to identify your receipt.

3. Simply input the details of your receipt and fill out the survey – it should take about two minutes and it’s just a few questions about your experience.

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4. At the end, you should get a five-digit number – write it on your old receipt and it becomes a voucher for a £1.99 Big Mac and fries (normally £4.08 or £4.49 as a meal with a drink).

5. Hand it over it to the cashier to claim the offer.

6. The beauty of this is you can keep the deal rolling with every single receipt, so all you have to do is make a single purchase to get your first receipt, use the voucher for the Big Mac and fries and with the subsequent receipt do it again and again – so you have cheap McDonald’s for as long as this survey goes on for.

The moneysavingexpert website says: "We’ve heard reports of some MoneySavers getting a receipt by buying sauce for just 20p. This may not work in all branches, so your safest bet is still the 59p McFlurry if you embarrass easily.

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"If you’re not a fan of Big Macs – or fancy something different – McDonald’s says you can ask for a Fillet-o-Fish or Veggie Deluxe instead. And if you're not in the mood for McDonald's, take a look at what else is available on our Restaurant Vouchers page.

"There is no expiry date once you have written your five-digit code on the receipt – but the numbers are trackable, so you can’t just write five random numbers on there. McDonald’s has told us it's valid in all of its restaurants."